chore: initial project setup

Phase 0 — full project scaffold with:
- Backend: FastAPI + SQLAlchemy 2.0 async + Alembic + PostgreSQL 16
- Frontend: React 18 + TypeScript + Vite + Tailwind CSS + shadcn/ui
- Docker Compose (prod + dev override with hot-reload)
- Health endpoint, CORS config, API proxy, env template

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/package.json

@@ -0,0 +1,54 @@
+{
+  "name": "budget-tracker-frontend",
+  "private": true,
+  "version": "0.1.0",
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "tsc -b && vite build",
+    "preview": "vite preview",
+    "lint": "eslint .",
+    "format": "prettier --write \"src/**/*.{ts,tsx,css}\"",
+    "test": "vitest run",
+    "test:watch": "vitest"
+  },
+  "dependencies": {
+    "@radix-ui/react-dialog": "1.1.4",
+    "@radix-ui/react-dropdown-menu": "2.1.4",
+    "@radix-ui/react-label": "2.1.1",
+    "@radix-ui/react-popover": "1.1.4",
+    "@radix-ui/react-select": "2.1.4",
+    "@radix-ui/react-slot": "1.1.1",
+    "@radix-ui/react-toast": "1.2.4",
+    "@tanstack/react-query": "5.62.8",
+    "axios": "1.7.9",
+    "class-variance-authority": "0.7.1",
+    "clsx": "2.1.1",
+    "lucide-react": "0.468.0",
+    "react": "18.3.1",
+    "react-dom": "18.3.1",
+    "react-router-dom": "7.1.1",
+    "recharts": "2.15.0",
+    "tailwind-merge": "2.6.0",
+    "tailwindcss-animate": "1.0.7"
+  },
+  "devDependencies": {
+    "@eslint/js": "9.17.0",
+    "@types/react": "18.3.18",
+    "@types/react-dom": "18.3.5",
+    "@vitejs/plugin-react": "4.3.4",
+    "autoprefixer": "10.4.20",
+    "eslint": "9.17.0",
+    "eslint-plugin-react-hooks": "5.1.0",
+    "eslint-plugin-react-refresh": "0.4.16",
+    "globals": "15.14.0",
+    "postcss": "8.4.49",
+    "prettier": "3.4.2",
+    "prettier-plugin-tailwindcss": "0.6.9",
+    "tailwindcss": "3.4.17",
+    "typescript": "5.7.2",
+    "typescript-eslint": "8.18.2",
+    "vite": "6.0.6",
+    "vitest": "2.1.8"
+  }
+}